| EXTENDED WASHER THICKNESS | 0.039 INCHES MINIMUM AND 0.061 INCHES MAXIMUM |
| EXTENDED WASHER DIAMETER | 0.307 INCHES MINIMUM AND 0.320 INCHES MAXIMUM |
| FASTENER LENGTH | 0.250 INCHES NOMINAL |
| HEAD HEIGHT | 0.087 INCHES MINIMUM AND 0.097 INCHES MAXIMUM |
| HEAD DIAMETER | 0.307 INCHES MINIMUM |
| HEAD STYLE | FILLISTER EXTENDED WASHER |
| INTERNAL DRIVE STYLE | CROSS RECESS TYPE 1 |
| PART NAME ASSIGNED BY CONTROLLING AGENCY | MACHINE SCREW SQUARE CONE LOCK WASHER SEMS |
| NOMINAL THREAD DIAMETER | 0.138 INCHES |
| SCREW MATERIAL | STEEL COMP 302 |
| THREAD CLASS | 2A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD LENGTH | 0.124 INCHES MINIMUM |
| THREAD QUANTITY PER INCH | 32 |
| THREAD SERIES DESIGNATOR | UNIFIED NATIONAL COARSE (UNC) |